Add docs for non-shaded JDBC driver JAR

[mosabua]

Description

See title and changes.

Additional context and related issues

Follow up to #22098

Release notes

(x) This is not user-visible or is docs only, and no release notes are required.

[gaeljw]

LGTM.

I was wondering if we should give some concrete use cases of one or the other but I think it's not that easy to give a "definitive" information. Some might use the fat JAR in a context where someone else might prefer the non shaded one.

[wendigo]

@gaeljw there are basically two use cases:

• JDBC driver used in some BI/IDE tool which usually don't have a maven resolver hence fat jar is used because it is standalone,

• JDBC driver used in the application (as a Maven/Gradle/SBT dependency), in this case the user can choose between fat-jar and non-shaded artifact, the latter usually requires settling on the version bounds/resolving conflicts which could be a tricky since the Trino depends on the latest versions of the libraries we depend upon